ADVANCED CENTER FOR JOINT SURGERY, LLC is a high-volume specialty ambulatory surgical clinic focused on major joint arthroplasty; its top two Medicare codes are 27447 (knee total joint replacement) and 27130 (hip replacement), which together reflect a practice centered on primary lower-extremity joint replacement procedures and implant use. The code mix and descriptions indicate the center performs definitive, implant-based joint reconstruction rather than minor arthroscopic or conservative procedures, consistent with an ambulatory surgical center organized around orthopedic arthroplasty services. Medicare revenue for this provider totals $8.4M while it has no Medicaid billing on file, making it effectively single-payer (Medicare) in the available claims data and suggesting negligible or no participation in state Medicaid programs. Revenue concentration is extreme: the top 3 Medicare codes account for 100.0% of its total Medicare revenue, and specifically the two listed codes alone make up the entirety of reported Medicare earnings, indicating very high dependence on a narrow procedural portfolio. The provider is an outsized national leader for both major arthroplasty codes: it ranks #1 nationally for 27447 out of 12,089 providers and #1 nationally for 27130 out of 8,062 providers, both labeled as "extreme outlier, far above typical national volume for this code," which signals dominant national volume for these CPTs rather than modest local activity. Average paid-per-claim levels are substantial for these procedures ($7,047 avg paid/claim for 27447 and $7,190 avg paid/claim for 27130) and combined with high claim counts (709 claims for 27447 and 467 claims for 27130) explain the concentrated $8.4M Medicare revenue figure; this mix implies revenue sensitivity to volume changes in primary hip and knee arthroplasty. The absence of Medicaid billing suggests either no contractual participation with Medicaid, a business model focused on Medicare-aged patients, or billing performed under non-Medicaid arrangements; analysts should treat this provider as effectively Medicare-focused when assessing payer risk and network strategy. The provider has been enumerated since 2018-03-08 (~8 years ago), indicating a multi-year operational history in the market during which it has achieved unusually high national volumes for major joint replacement codes, which may reflect capacity, referral relationships, or specialization driving concentrated Medicare utilization. Given the extreme national ranking and 100.0% revenue concentration in the top codes, strategic considerations for payers or competitors should center on joint replacement capacity and outcomes metrics rather than broad outpatient procedure mix, because changes in arthroplasty demand or reimbursement would disproportionately affect this center's revenue profile.